Balanced slide-valve



2 Sheets-Sheet 1.

(No Model.)

J. G. MINBR.

BALANGED SLIDE VALVE.

No. 314,258. Patented Mar. 24, 1885.

(No Model.)

J. G. MINER.

2 Shets-Sheet 2.

` BALANGED SLIDE VALVE. No. 314,258.

Patented Maf. 24, 1885. @i

Nfl-

A SRHHIHW 'Q l 'l .IIHIG 'HHHHHHI MN5] C) NTTnD STATES PATENT Ormea.

JAMES G. MINER,` OF CINCINNATI, OHIO.

BALANCED SLIDE-VALVE.

SPECIFICATION Y forming-part of Letters Patent No. 314,258, dated March24, 1885.

Application tiled November 1, H54. (No model.)

` To all whom it may concern.-

` Be it known that I, JAMES G. Minna. a citizen of the United States,residing at Cincinnati, in the county of Hamilton and State of Ohio,have invented certain new and useful Improvements in BalancedSlide-Valves, of which the following is a full, clear, and exactdescription, 'reference being had to the accompanying drawings, forminga part of this specification.

My invention relates to that class of balanced slide-valves, preferablyfor locomotiveengines, in which the valve is supported uponanti-friction rollers, and in which the downward pressure exerted by thesteam upon the valve is relieved or counterbalanced by an upwardsteam-pressure acting lupon lifting devices secured to avertically-movable piston confined and working in a chamber formed inthe steam-chest cover. The object of my invention is to simplify theconstruction ot' this class of devices, and to insure the more perfectworking and adjustment ot' the parts; and itsnovelty eonsists in theconstruction, combination, and arrangement of the parts, all as will beherewith set forth and specilically claimed.

In theaccompanying drawings, Figure l, Sheet l, is a central section inside elevation of the steam-chest, the contained valve and itsappliances, and the induction and exhaust ports. Fig. 2, Sheet 1, is acentral sectional view in end elevation ofthe steam-chest, valve, andits appliances. Fig. 3, Sheet 2, is an internal plan view of thesteam-chest cover. Fig. 4, Sheet 2, is a plan view of the rollerframeand rollers, the saine being shown in sectional end elevation directlybelow said iigure. Fig. 5,- Sheet 2, `is a diminished perspective Viewof the vertically-moving piston and its integral yoke-extensions.

The same letters of reference are used to indicate identical parts inall the gures.

I have illustrated herein the well-known form of locomotive steam-chestand D-valve, to which my invention is applied; but I do not thereby wishto be understood as limiting myself` to this class of valves only, as myinvention is equally applicable to all classes of slide- 5o valves.

In the drawings,A is the upper portion of f the main cylinder,containing the usual induction-ports, B, exhaust C. and valve-seat D,

upon which, within the chest E, travels the ther upper circularpiston-chamber, K, as seen more particularly in Fig. 3. This cover,together with the steam-chest, is bolted down in the usual or anysuitable manner.

Fitted within t-he chamber K by means of packing-rings a, secured vby afollower-head, I), is the vertieally-traveling piston L, having lateralextensions M and pendent inturned ends N, upon which rests and isboltedthe rectangular lifting-plate O. The shape of this pistonanditsyolrc-extensionsis clearly shown in Fig. 5.

It will be seen by reference to Fig. 1 that the vertical portions ot'the yoke-extensions M are provided with chipping-strips t', which engagewith corresponding chipping-strips or the inner adjacent ends of thewalls ofthe coiver itself, whereby a pert'ectguide is formed to insureabsolutely the true vertical working ot' the piston L. `This resultcould also be obtained by having,` the adjacent bearing-surfaces ot' thevertical portions ot the yoke-extension M and the chamber J planed trueand in contact with or without packings.

Upon the lifting-plate O is fitted a rectangular roller-frame, P, whoseside walls, c, are rabbeted, so as to overlap and embrace the sides ofthe lifting-plate, as shown in Fig. 2.

This frame has journaled in its side wallsasel ries of rollers, d.,which rest an d travel upon the plate O in the directions of the travelof the valve. By having the side rails of the rollerframe overlappingthe sides of tlie liftingplate, so as to embrace the same, a true guideis formed, which prevents the roller-frame from binding or fromtraveling in any other than direct lines.

Resting upon the rollers d is a plate, R, which is bolted or otherwisesecured to inturned vertical extensions S of the valve F, as seen at e,Fig. 2.

From this construction it will be seen that the valve F is vsupporteddirectly upon the friction-rollers d, which latter are carried by thepiston L and its attachments in such :manner that the pressure of steamdownward upon the valve can be counteracted to any extent desired by theproportioning of the parts and their relative areas by the pressure ofthe steam upward acting against the piston L, as will be readilyunderstood. The extent of upward travel of the piston L is regulated byset-screws f, tapped through the head of the chamber K, and bearingagainst the i`ollowerhead b. These screws may have the usual jam-nuts,7L. I form any suitable vent, g, through the head of the chamber K toget rid of any leakage of steam that may take place. It will be observedthat the rollers d extend almost the entire width of the plate O,thereby preventing unequal wear or channeling, and by making theserollers of such diameters that the shortest stroke of the valve givesthem at least one entire revolution they are kept perfectly cylindricaland true.

I am aware that valves have been before supported on shortfriction-rollers, and have been counterbalanced by vertically-actuatedpistons; but,

Having thus fully described my invention, I claim- 1. The piston L, withyoke-extensions M N, supporting the lifting-plate O, in combination withthe slide-valve supported and traveling compelled to travel in true anddirect lines,

substantially as described.

3. The piston L, with yokeextensions M N, supporting the lifting-plateO, the vertical portions oi' said yoke-extensions bearing and travelingupon the adjacent inner end walls of the cover, wherebysaid piston iscaused to travel absolutely true, in combination with the slide-valvesupported and traveling on said plate through the medium offriction-rollers, substantially as described.

J. G. MINER.

W'itnesses:

En. WV. RECTOR, OTTO RICHTER.

